{"schemaVersion":"jobsearcher.job.v1","id":"fd9b935670e55d316c5f6f13","url":"https://jobsearcher.com/jobs/fd9b935670e55d316c5f6f13","canonicalUrl":"https://jobsearcher.com/jobs/fd9b935670e55d316c5f6f13","title":"Sr. Embedded Software Engineer","description":"The ideal candidate will design, develop, and maintain firmware for LoRaWAN module product lines (including xDot) and custom sensor applications. Work across Arm Mbed OS and Zephyr RTOS targeting STM32 and low-power Arm Cortex-M microcontrollers, delivering production AT command firmware, LoRaWAN Class A/B/C protocol compliance, and customer sensor solutions. This is the RTOS/RF-focused role required to continue LoRaWAN xDot development.\r\nResponsibilitiesDevelop and maintain LoRaWAN module AT command firmware across multiple hardware variants\r\nOwn the LoRaWAN MAC layer library — Class A/B/C operation, multicast, FOTA, ADR, regional parameter compliance\r\nImplement and validate LoRaWAN specification compliance including Class B beacon timing, ping-slot scheduling, and multicast\r\nPort and maintain Zephyr RTOS board support packages including board definitions, device drivers, and subsystem integration\r\nDevelop custom LoRaWAN sensor applications using Mbed OS and Zephyr RTOS for customer-specific deployments\r\nBring up and validate new hardware variants and component changes across the product line\r\nDesign and execute comprehensive host-based test suites using CppUTest and Zephyr Twister\r\nMaintain bootloaders and FOTA update infrastructure for secure field updates\r\nOptimize power consumption for battery-operated devices targeting ultra-low-power sleep modes\r\nSupport LoRa Alliance technical working group contributions (L2 protocol, payload schema)Qualifications5+ years bare-metal and RTOS firmware development on Arm Cortex-M (M0+, M3, M4)\r\nStrong C/C++ for resource-constrained MCUs (32KB RAM / 256KB Flash targets)\r\nLoRaWAN protocol stack implementation experience (MAC layer, Class A/B/C, regional parameters)\r\nSTM32 family (STM32L151, STM32L4, STM32U3) — peripherals, low-power modes, HAL/LL drivers\r\nMbed OS 6.x application development and build system\r\nZephyr RTOS — device tree, Kconfig, west build system, subsystem development\r\nJTAG/SWD debugging, logic analyzer, RF test equipment\r\nGit, CI/CD (Jenkins), automated firmware testing\r\nAT command interface design and implementation#J-18808-Ljbffr","company":"Multi Tech","rawCompany":"multi tech","city":"Mounds View","state":"MN","isRemote":false,"isActive":false,"createdAt":"2026-10-05T01:51:07.893Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"17-2072.00","title":"Electronics Engineers, Except Computer","slug":"electronics-engineers-except-computer"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"334220","title":"Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing","slug":"radio-and-television-broadcasting-and-wireless-communications-equipment-manufacturing"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Sr. Embedded Software Engineer","description":"The ideal candidate will design, develop, and maintain firmware for LoRaWAN module product lines (including xDot) and custom sensor applications. Work across Arm Mbed OS and Zephyr RTOS targeting STM32 and low-power Arm Cortex-M microcontrollers, delivering production AT command firmware, LoRaWAN Class A/B/C protocol compliance, and customer sensor solutions. This is the RTOS/RF-focused role required to continue LoRaWAN xDot development.\r\nResponsibilitiesDevelop and maintain LoRaWAN module AT command firmware across multiple hardware variants\r\nOwn the LoRaWAN MAC layer library — Class A/B/C operation, multicast, FOTA, ADR, regional parameter compliance\r\nImplement and validate LoRaWAN specification compliance including Class B beacon timing, ping-slot scheduling, and multicast\r\nPort and maintain Zephyr RTOS board support packages including board definitions, device drivers, and subsystem integration\r\nDevelop custom LoRaWAN sensor applications using Mbed OS and Zephyr RTOS for customer-specific deployments\r\nBring up and validate new hardware variants and component changes across the product line\r\nDesign and execute comprehensive host-based test suites using CppUTest and Zephyr Twister\r\nMaintain bootloaders and FOTA update infrastructure for secure field updates\r\nOptimize power consumption for battery-operated devices targeting ultra-low-power sleep modes\r\nSupport LoRa Alliance technical working group contributions (L2 protocol, payload schema)Qualifications5+ years bare-metal and RTOS firmware development on Arm Cortex-M (M0+, M3, M4)\r\nStrong C/C++ for resource-constrained MCUs (32KB RAM / 256KB Flash targets)\r\nLoRaWAN protocol stack implementation experience (MAC layer, Class A/B/C, regional parameters)\r\nSTM32 family (STM32L151, STM32L4, STM32U3) — peripherals, low-power modes, HAL/LL drivers\r\nMbed OS 6.x application development and build system\r\nZephyr RTOS — device tree, Kconfig, west build system, subsystem development\r\nJTAG/SWD debugging, logic analyzer, RF test equipment\r\nGit, CI/CD (Jenkins), automated firmware testing\r\nAT command interface design and implementation#J-18808-Ljbffr","datePosted":"2026-10-05T01:51:07.893Z","dateModified":"2026-10-05T01:51:07.893Z","hiringOrganization":{"@type":"Organization","name":"Multi Tech","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Mounds View","addressRegion":"MN","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"fd9b935670e55d316c5f6f13"},"url":"https://jobsearcher.com/jobs/fd9b935670e55d316c5f6f13"}}